61results about How to "Delay thermal runaway" patented technology

A power added efficiency optimizer apparatus is provided for measuring and monitoring input and output power of an amplifying device, and adjusting the load impedance seen by the amplifying device so that power added efficiency is maintained at optimum levels. A power added efficiency optimizing device includes a variable load impedance that can be controlled, at least one power detection device located after the load, a difference forming apparatus, and at least one coupling device. The power added efficiency optimizing device provides an ability to maintain an amplifier at peak efficiency in a dynamic way and in the presence of changing electromagnetic load conditions.

The invention discloses a lithium ion secondary battery and an electronic product comprising same, an electric vehicle and mechanical equipment. The lithium ion secondary battery comprises a battery cell and an electrolyte, wherein a positive electrode active material of the battery cell comprises a lithium-manganese-based positive active material; the electrolyte comprises a solvent, a lithium salt and an additive, wherein the additive comprises vinylene carbonate; the percentage q of the weight of the electrolyte to the total weight of a positive electrode active material layer in the battery cell, the weight percentage r of vinylene carbonate in the electrolyte, the compaction density s of a negative electrode active material layer in the battery cell and the weight percentage p of a manganese element in the positive electrode active material meet the condition that q.r.s / p is larger than or equal to 0.05 and smaller than or equal to 6, the units of q, r and p are all wt%, and the unit of s is g / cm < 3 >. The lithium ion secondary battery provided by the invention can simultaneously consider relatively high safety performance, cycle performance and storage performance.

The invention belongs to the technical field of lithium ion batteries and specifically relates to a high-safety lithium manganese iron phosphate battery. The high-safety lithium manganese iron phosphate battery comprises a positive plate, a negative plate, an isolating membrane, an electrolyte and a battery shell, wherein the positive plate includes a positive pole current collector and a positive pole active material layer which is coated on a surface of the positive pole current collector; the positive pole active material layer includes the following components by weight percentage: 90wt%-96wt% of positive pole active material, 1.5wt%-5wt% of positive pole conductive agent and 2wt%-5wt% of positive pole binding agent; the positive pole conductive agent is a mixture of conductive carbon black and at least one of a carbon nano tube or graphene; and the ratio of the conductive carbon black to at least another conductive agent is 1wt%:0.5wt% to 4wt%:1wt% based on the weight percentage in the positive pole active material layer; the isolating membrane is one of a polyolefin film or a non-woven cloth film; and the electrolyte is a high-temperature-resistant electrolyte. Compared with a nickel cobalt lithium manganate ternary battery and a lithium iron phosphate battery, the high-safety lithium manganese iron phosphate battery has relatively high weight specific energy and relatively high safety performance at the same time, has a long cycle life and is suitable for popularization and application in the field of new energy vehicles.